Superconductivity Suppression Close to the Metal-Insulator Transition in Strongly Disordered Systems

TL;DR

This paper investigates how superconductivity is suppressed near the metal-insulator transition in strongly disordered systems, using a self-consistent theory that includes interaction effects and fits experimental data well.

Contribution

It introduces a self-consistent theoretical framework for understanding $T_c$ suppression in disordered superconductors near the metal-insulator transition.

Findings

The theory successfully fits experimental data across a wide disorder range.

Superconductivity suppression correlates with Coulomb pseudogap formation.

The model explains the transition from metal to insulator in disordered systems.

Abstract

On the basis of the recently proposed self-consistent theory of metal- insulator transition in strongly disordered systems, taking into account interaction effects, we study transition temperature $T_{c}$ suppression in disordered superconductors for the wide disorder interval --- from weakly disordered metal up to Anderson insulator, induced by "Coulomb pseudogap" formation in the density of states. It is shown that for a number of systems this theory provides rather satisfactory fit of experimental data.